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Diffstat (limited to 'external_libs/yaml-cpp/util/api.cpp')
| -rw-r--r-- | external_libs/yaml-cpp/util/api.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/external_libs/yaml-cpp/util/api.cpp b/external_libs/yaml-cpp/util/api.cpp new file mode 100644 index 00000000..e5180a8a --- /dev/null +++ b/external_libs/yaml-cpp/util/api.cpp @@ -0,0 +1,129 @@ +// a sketch of what the new API might look like + +#include "yaml-cpp/yaml.h" +#include <iostream> + +int main() +{ + { + // test.yaml + // - foo + // - primes: [2, 3, 5, 7, 11] + // odds: [1, 3, 5, 7, 9, 11] + // - [x, y] + + // move-like semantics + YAML::Value root = YAML::Parse("test.yaml"); + + std::cout << root[0].as<std::string>(); // "foo" + std::cout << str(root[0]); // "foo", shorthand? + std::cout << root[1]["primes"][3].as<int>(); // "7" + std::cout << root[1]["odds"][6].as<int>(); // throws? + + root[2].push_back(5); + root[3] = "Hello, World"; + root[0].reset(); + root[0]["key"] = "value"; + + std::cout << root; + // # not sure about formatting + // - {key: value} + // - primes: [2, 3, 5, 7, 11] + // odds: [1, 3, 5, 7, 9, 11] + // - [x, y, 5] + // - Hello, World + } + + { + // for all copy-like commands, think of python's "name/value" semantics + YAML::Value root = "Hello"; // Hello + root = YAML::Sequence(); // [] + root[0] = 0; // [0] + root[2] = "two"; // [0, ~, two] # forces root[1] to be initialized to null + + YAML::Value other = root; // both point to the same thing + other[0] = 5; // now root[0] is 0 also + other.push_back(root); // &1 [5, ~, two, *1] + other[3][0] = 0; // &1 [0, ~, two, *1] # since it's a true alias + other.push_back(Copy(root)); // &1 [0, ~, two, *1, &2 [0, ~, two, *2]] + other[4][0] = 5; // &1 [0, ~, two, *1, &2 [5, ~, two, *2]] # they're really different + } + + { + YAML::Value node; // ~ + node[0] = 1; // [1] # auto-construct a sequence + node["key"] = 5; // {0: 1, key: 5} # auto-turn it into a map + node.push_back(10); // error, can't turn a map into a sequence + node.erase("key"); // {0: 1} # still a map, even if we remove the key that caused the problem + node = "Hello"; // Hello # assignment overwrites everything, so it's now just a plain scalar + } + + { + YAML::Value map; // ~ + map[3] = 1; // {3: 1} # auto-constructs a map, *not* a sequence + + YAML::Value seq; // ~ + seq = YAML::Sequence(); // [] + seq[3] = 1; // [~, ~, ~, 1] + } + + { + YAML::Value node; // ~ + node[0] = node; // &1 [*1] # fun stuff + } + + { + YAML::Value node; + YAML::Value subnode = node["key"]; // 'subnode' is not instantiated ('node' is still null) + subnode = "value"; // {key: value} # now it is + YAML::Value subnode2 = node["key2"]; + node["key3"] = subnode2; // subnode2 is still not instantiated, but node["key3"] is "pseudo" aliased to it + subnode2 = "monkey"; // {key: value, key2: &1 monkey, key3: *1} # bam! it instantiates both + } + + { + YAML::Value seq = YAML::Sequence(); + seq[0] = "zero"; // [zero] + seq[1] = seq[0]; // [&1 zero, *1] + seq[0] = seq[1]; // [&1 zero, *1] # no-op (they both alias the same thing, so setting them equal is nothing) + Is(seq[0], seq[1]); // true + seq[1] = "one"; // [&1 one, *1] + UnAlias(seq[1]); // [one, one] + Is(seq[0], seq[1]); // false + } + + { + YAML::Value root; + root.push_back("zero"); + root.push_back("one"); + root.push_back("two"); + YAML::Value two = root[2]; + root = "scalar"; // 'two' is still "two", even though 'root' is "scalar" (the sequence effectively no longer exists) + + // Note: in all likelihood, the memory for nodes "zero" and "one" is still allocated. How can it go away? Weak pointers? + } + + { + YAML::Value root; // ~ + root[0] = root; // &1 [*1] + root[0] = 5; // [5] + } + + { + YAML::Value root; + YAML::Value key; + key["key"] = "value"; + root[key] = key; // &1 {key: value}: *1 + } + + { + YAML::Value root; + root[0] = "hi"; + root[1][0] = "bye"; + root[1][1] = root; // &1 [hi, [bye, *1]] # root + YAML::Value sub = root[1]; // &1 [bye, [hi, *1]] # sub + root = "gone"; // [bye, gone] # sub + } + + return 0; +} |